A remarkable property of acids is that they can 'dissolve' metals. When metals are added to an acid, they disintegrate and disappear into the acid.
If the acid with the 'dissolved' metal is evaporated, can we get the metal back? Why or why not?
Important Questions on Acids, Bases and Salts
A remarkable property of acids is that they can 'dissolve' metals. When metals are added to an acid, they disintegrate and disappear into the acid.
In this question, the word 'dissolve' is used within quotes. This is because it is not actually an example of dissolving. What is the main difference between a metal 'dissolving' in an acid and sugar dissolving in water?
Sunita carried out the following reactions in the laboratory:
- Complete neutralisation of one mole of sodium carbonate with hydrochloric acid
- Complete neutralisation of one mole of sodium bicarbonate with hydrochloric acid
She found that the amount of carbon dioxide formed in both the reactions was the same.
Sunita carried out the following reactions in the laboratory:
Complete neutralisation of one mole of sodium carbonate with hydrochloric acid
Complete neutralisation of one mole of sodium bicarbonate with hydrochloric acid
How does the amount of salt formed in case (i) compare with the amount of salt formed in case (ii)?
To prepare a salad dressing, Parag adds a solution of sodium chloride in distilled water to vinegar.
State what change will occur in the following:
- The pH of the vinegar
- The acidity of the vinegar
Rajesh was given a substance and asked to identify it. He conducted three tests on the substance and recorded the results below. (P) It releases carbon dioxide, water, and a sodium salt on heating with water. (Q) It turns universal indicator greenish-blue. (R) It can be prepared from ammonia as a raw material.
What substance was Rajesh given?
Rajesh was given a substance and asked to identify it. He conducted three tests on the substance and recorded the results below. (P) It releases carbon dioxide, water, and a sodium salt on heating with water. (Q) It turns universal indicator greenish-blue. (R) It can be prepared from ammonia as a raw material.
Give one use of the substance based on the properties mentioned in P and Q.
Rajesh was given a substance and asked to identify it. He conducted three tests on the substance and recorded the results below. (P) It releases carbon dioxide, water, and a sodium salt on heating with water. (Q) It turns universal indicator greenish-blue. (R) It can be prepared from ammonia as a raw material.
Rajesh later read that recrystallisation of the sodium salt formed in P gives another basic salt that is used in manufacture of borax.
Identify the sodium salt formed in P.
